JP2011005441A - Coating apparatus and coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating tool capable of coping with a coating material having any viscosity from low to high and improving coating speed, and to provide a coating method using the same.SOLUTION: The coating tool is detachably connected to a supply member 5 to which the coating material is supplied by the work of a compressed gas and is provided with a body having a flow path through which the coating material supplied from the supply member 5 flows, a plurality of discharge nozzles 63a-63c branched from the flow path, and a brush 62 formed by bundling many furs and attached to the body to house the plurality of discharge nozzles 63a-63c branched from the flow path, and is constituted so that the discharge quantity of the coating material from the discharge nozzle 63a farthest from the supply member 5 in the plurality of discharge nozzles 63a-63c is more than the discharge quantity of the coating material from the discharge nozzle 63c nearest to the supply member 5.

Description

  The present invention relates to a coating tool for applying a paint and a coating method.

  As a coating machine used for the coating of high structures, such as a steel tower, it is indicated by patent documents 1 and 2, for example. This main type of painting machine is equipped with a portable gas cylinder carried by an operator and a carrying paint tank. The coating is performed by pumping the paint in the paint tank to the applicator such as a brush with the gas pressure of the gas cylinder.

  In a method using such a coating machine, a sufficient amount of paint can be supplied when a high viscosity paint of about 5 Pa · s or more is used due to the influence of gravity and pressure loss between the pipes in the tank body. There wasn't. For this reason, it is not easy to obtain a desired thick film by a single coating.

  Therefore, as disclosed in Patent Document 3, the applicant of the present invention can perform high-viscosity paint coating suitable for thick-film coating of high-viscosity paint, which can efficiently and thickly coat even high-viscosity paint. A device was proposed.

  However, when painting various parts of the steel tower using the brush coating apparatus, if the viscosity of the paint is lowered, the condition of the paint contained in the brush is changed, which may cause problems in painting workability.

  For the purpose of improving the convenience of the painter, for example, Patent Document 4 proposes a brush device that attaches a brush at a certain angle to the tip of the paint supply body and allows the operator to move the wrist freely. Yes. However, since this brush device is an airless coating machine, a paint hose from the ground is necessary, and it is difficult to lay the hose down and the workability is lowered.

Japanese Patent Laid-Open No. 10-34063 JP 2002-263556 A JP 2008-671 A JP 2006-314950 A

  An object of this invention is to provide the applicator which can respond from a low-viscosity coating material to a high-viscosity coating material, and can improve a coating speed, and a coating method using the same.

  The present invention is an applicator detachably connected to a supply member to which paint is supplied by the action of compressed gas, the main body having a flow path through which the paint supplied from the supply member flows, and the flow A plurality of discharge nozzles that branch from the path, and a brush portion that is configured by bundling a large number of hairs and that is attached to the main body portion and accommodates the plurality of discharge nozzles. Among these, the discharge amount of the paint from the discharge nozzle farthest from the supply member is configured to be larger than the discharge amount of the paint from the discharge nozzle closest to the supply member.

  According to this configuration, since a plurality of discharge nozzles are provided, it is possible to apply to a surface to be applied having a large area. In addition, since the amount of paint discharged from the discharge nozzle farthest from the supply member is larger than the amount of paint discharged from the discharge nozzle closest to the supply member, the paint to the inside of the brush portion The amount of paint discharged is properly controlled, and the paint content on the brush part is good, from low-viscosity paints to high-viscosity paints (for example, 0.3 Pa · s to 30 Pa · s). It is possible to paint with an appropriate film thickness.

  Such an applicator can be used as part of a coating system. For example, in a coating apparatus provided with a paint tank containing paint, compressed gas injection means for injecting compressed gas into the paint tank, and a flexible supply member connected to the paint tank. It can be connected to a member. As the supply member, for example, a flexible tube member can be used.

  In the applicator, the main body is attached to the opposite side of the discharge nozzle and can be supported by a hand, a control handle for controlling the supply of paint to the discharge nozzle, and the control section A first operating lever and a second operating lever for driving the motor. The first and second operation levers may be provided so as to sandwich the control unit, and one of the operation levers may extend to the handle side.

  Thus, by providing the handle and the two operation levers, it is possible to select either how to hold the pen grip or the palm hand, while maintaining the compact usability of a normal brush. For this reason, the design is such that the brush portion can be turned even in difficult-to-reach painting places, and the painter's usability can be improved in correspondence with all painting places even in high-altitude work.

Although the said control part can have various structures, it can have a needle valve which opens and closes the middle of a flow path, for example. The needle valve can be opened and closed by pressing either one of the first and second operation levers. In addition, as long as the middle of a flow path can be opened and closed, valves other than a needle valve can also be used.
In addition, a fixture for swingably fixing each operation lever with respect to the main body is further provided, and each operation lever can be swung about the fixture, and the valve body of the needle valve can be swung by the swing. Can be configured to be movable in the axial direction. And the distance of a fixture and the axial center line of a valve body can be 4-10 mm. According to this configuration, since the distance between the fixture and the axial center line of the valve body is small, it is possible to prevent the paint from leaking and to prevent fatigue during operation.

  In the applicator, the nozzle lengths of the plurality of discharge nozzles can be the same. The nozzle diameter of the discharge nozzle that is the furthest away from the supply member can be 1.2 to 3.0 times the nozzle diameter of the discharge nozzle that is the closest to the supply member. According to this structure, it is suitable from the point of the inclusion condition to the brush part by fluid speed control of a coating material.

  In the said applicator, the discharge outlet of a discharge nozzle can be arrange | positioned in the position of 5-50 mm from the bristles of the said brush part. By doing in this way, the inclusion condition of the paint to a brush part becomes favorable, and the liquid dripping from a brush part front-end | tip can be prevented. For example, if this distance is less than 5 mm, there is a risk of liquid drip from the tip of the brush part and poor coating due to contact of the nozzle with the object to be coated. On the other hand, if this distance exceeds 50 mm, the paint will be included in the brush part, which may lead to coating film sag or uneven film thickness, which is not preferable.

  The present invention is a coating method using the above-described coating tool, the step of preparing a paint having a viscosity of 0.3 to 30 Pa · s, and 3 to 10 ml / second with respect to the main body. , Supplying the paint, and discharging the paint from the nozzle and applying the paint to the surface to be applied by the brush portion.

  According to the present invention, it is possible to cope with a paint having a low viscosity to a paint having a certain degree of viscosity, and the coating speed can be improved.

It is a conceptual diagram which shows one embodiment of the coating system which concerns on this invention. It is a side view which expands and shows the applicator of the coating system of FIG. The front view of the applicator of FIG. 2 (a) Sectional drawing (b) of a main-body part, and the bottom view (c) of a main-body part. It is a side view which expands and shows the nozzle and control part of the applicator of FIG. It is a side view which shows the use condition of an applicator.

  An embodiment of a paint tool according to the present invention will be described with reference to FIGS. Below, the case where this coating tool is mounted | worn with the coating system which applies a coating material is demonstrated.

  As shown in FIG. 1, a coating system 1 according to the present embodiment includes a paint tank 2 in which paint is stored, and a gas cylinder 3 that supplies compressed gas to the paint tank 2. Are connected via a compressed gas supply pipe 3a. The paint tank 2 is connected to an applicator 6 for applying the paint to the surface to be applied via a flexible pipe (supply member) 5 for supplying the paint.

  The gas cylinder 3 is provided with a supply port 4 to which a supply pipe 3a is connected. Further, in the middle of the supply pipe 3a, a pressure regulator 7 such as a regulator for adjusting the supply pressure of the compressed gas, and an on-off valve (two-way valve) 8 are provided. Among these, the pressure regulator 7 is disposed on the gas cylinder 3 side, and also serves as a relief valve that can be manually operated. The material of the supply pipe 3a is not particularly limited, and materials such as urethane and nylon can be used, but those having a breaking pressure of 2.0 MPa or more and a maximum working pressure of 1.0 MPa or more are preferable. As an example, a urethane tube having an inner diameter of 4 mm, an outer diameter of 6 mm, a breaking pressure of 2.1 MPa, and a maximum working pressure of 1.0 MPa can be used.

  Further, the material of the flexible tube 5 is not limited as long as it has solvent resistance and has a breakdown pressure of 2.0 MPa or more and a maximum use pressure of 0.5 MPa or more. Here, “solvent resistance” means that, when in contact with an organic solvent such as toluene or xylene, although there is a slight amount of swelling and alteration, it does not dissolve but deteriorates little. Examples of such materials include urethane and nylon.

  Since the flexible tube 5 has a large pressure loss when the inner diameter is thin, it is preferable that the inner diameter is as large as possible. The inner diameter of the flexible tube 5 is preferably 5 to 15 mm. This is because if the inner diameter is smaller than 5 mm, the pressure loss is large, and in order to obtain a sufficient discharge amount, it is necessary to increase the gas pressure. On the other hand, if the inner diameter is larger than 15 mm, the operability of the flexible tube 5 (handling) This is because the coating work is hindered. As an example, the flexible tube 5 has a two-layer structure of nylon on the inside and urethane on the outside, and can have a breaking pressure of 2.1 MPa, a maximum working pressure of 1.0 MPa, an inner diameter of 9.5 mm, and an outer diameter of 13 mm. .

  The paint tank 2 includes a cylindrical container body 11 provided with a paint discharge port (not shown) on the bottom surface, and the flexible tube 5 described above is connected to the discharge port. The top of the container body 11 is closed with a lid 13, and a compressed gas injection port 12 to which the above-described supply pipe 3 a is connected is airtightly attached to the lid 13. .

  The injection port 12 may be attached to the outer peripheral surface of the upper part of the container body 11. Further, the pressurized gas cylinder 3 can be attached to the container body 11 or the lid body 13 in addition to being suspended from a waist belt or the like. Further, instead of the pressurized gas cylinder, a compressor (not shown) is installed as a compressed gas supply source, and the compressor discharge port and the compressed gas injection port 12 are connected by a hose (not shown) to supply the compressed gas. Anyway. Although not shown, the paint tank 2 is preferably a portable type such as a backpack type or a waist belt hanging type by providing a shoulder band, a waist band and the like.

  Subsequently, the applicator 6 will be described. As shown in FIGS. 2 and 3, the applicator 6 according to this embodiment includes a stick-like handle 61 and a main body 60 fixed to the tip of the handle 61. Further, a brush part 62 for applying a paint is attached to the main body part 60, and the brush part 62 is configured by bundling hairs. The above-described flexible tube 5 is inserted into the handle 61 so as to supply paint to the main body 60. The main body 60 functions as a manifold, and includes a flow path 67 through which the coating material supplied from the flexible tube 5 passes, and three discharge nozzles 63a, 63b, and 63c branched from the flow path 67. The three discharge nozzles 63 a, 63 b, 63 c extend from the flow path 67 so as to be arranged in parallel, and are inserted into the brush portion 62. And the coating material discharged from each discharge nozzle 63a, 63b, 63c is apply | coated to a target object via the brush part 62. FIG. Here, the discharge nozzle farthest from the handle 61 is the first nozzle 63a, the discharge nozzle closest to the handle 61 is the third nozzle 63c, and the discharge nozzle between the first nozzle 63a and the third nozzle 63c is the second nozzle 63b. It shall be called.

  Moreover, each discharge nozzle 63a, 63b, 63c can be designed as follows. For example, the paint discharge amount of the first nozzle 63a is larger than the paint discharge amount of the second discharge nozzle 63b, and the paint discharge amount of the second discharge nozzle 63b is larger than the paint discharge amount of the third discharge nozzle 63c. Thus, the nozzle diameter (inner diameter) is adjusted. This is for the following reason. This is because if the paint discharge amount of the first discharge nozzle 63a is smaller than the paint discharge amounts of the other discharge nozzles 63b and 63c, the painting operation is slowed down, and there is a risk that a sufficient coating film thickness cannot be secured. .

  In particular, the nozzle lengths of the discharge nozzles 63a, 63b, and 63c are all the same, and the nozzle diameter (inner diameter) of the first discharge nozzle 63a is 1.2 to 3.3 of the nozzle diameter (inner diameter) of the third discharge nozzle 63c. A value of 0 times, particularly 1.2 to 2.0 times is preferable from the viewpoint of inclusion in the brush portion 62 by controlling the fluid velocity of the paint. Further, the nozzle length of each of the discharge nozzles 63a, 63b, 63c can be determined based on the length e of the brush portion 62 from the bristles. The length e is preferably 5 to 50 mm, and more preferably 10 to 40 mm, from the viewpoint of the coating material contained in the brush part and liquid dripping from the tip of the brush part. If this distance e is less than 5 mm, there is a risk of liquid drip from the tip of the brush part 62 and poor coating due to contact of the nozzle with the object to be coated. On the other hand, if the length e exceeds 50 mm, it is not preferable because the coating portion contains more paint in the brush portion and may lead to coating film sag or uneven film thickness.

  A control unit 64 that controls the supply of the paint to the paint discharge nozzle 63 is attached in the middle of the flow path of the main body 60. The control unit 64 includes a needle valve fitted in the main body unit 60 and a pair of operation levers 66a and 66b for operating the needle valve. As shown in FIG. 4A, a hole is formed in the end (upper part) on the opposite side to the discharge nozzles 63 a, 63 b, 63 c in the main body 60, and this hole communicates with the flow path 67. ing. And the needle valve mentioned above is inserted in this hole. The needle valve is provided with a shaft-like valve body and a valve seat with which the valve body is brought into contact with and separated from the valve body, and the valve body is urged by a compression coil spring 651 to close the passage 67 in the middle. Further, the valve body is fitted into the hole of the main body 60 via an O-ring, thereby preventing liquid leakage from the hole. As such an O-ring, it is preferable to use elastic silicone rubber, EPDM, perfluoroelastomer or the like having a low swelling rate due to the solvent in the paint from the viewpoint of preventing liquid leakage.

  Further, the upper end portion of the valve element protrudes from the main body 60 to the outside, and two rod-like operation levers, that is, first and second operation levers 66a and 66b are attached to the protruding portion. The first operation lever 66a extends upward along the handle 61, and the second operation lever 66b extends downward toward the discharge nozzle in the opposite direction to the first operation lever 66a. The first operation lever 66a is fixed to the main body 60 via a cylindrical bar 66a1 provided at a position slightly away from the valve body, and the first operation lever 66a is swingable about the cylindrical bar 66a1. It has become. That is, as shown in FIG. 4B, when the first operating lever 66a is pushed into the handle 61 side and swung, the upper end of the valve body is pulled up, and the valve body is separated from the valve seat. Yes. Similarly, the second operation lever 66b is also fixed to the main body 60 via a cylindrical bar 66a1 provided at a position slightly away from the valve body, and the second operation lever 66b is centered on the cylindrical bar 66b1. It can swing freely. Therefore, as shown in FIG. 4C, when the second operation lever 66b is pushed toward the discharge nozzle side, the upper end of the valve body is pulled up to separate the valve body from the valve seat. By pushing the operation levers 66a and 66b as described above, the flow path 67 is opened, and the paint is discharged from the discharge nozzles 63a, 63b, and 63c.

  The first operating lever 66a can be kept compact and convenient like a normal brush by narrowing the width to the extent that it can be accommodated in the handle 61. On the other hand, the second operation lever 66b can have a width (20 to 40 mm) that is about the same as the width of the brush portion 62 so that the second operation lever 66b can be easily pressed with a fingertip. Moreover, it is preferable that the load of both the operating levers 66a and 66b is set to about 1.0 to 5.0 N. By doing so, the painter can paint without feeling uncomfortable and without accumulating fatigue due to long-time work. be able to.

  Further, the cylindrical bars 66a1 and 66b1 act as fulcrums for swinging of the operation levers 66a and 66b, and extend in the paper surface direction of FIG. It is preferable to design the distance d between the center axis of the cylindrical bars 66a1 and 66b1 and the center line of the valve body 652 of the needle valve 65 as small as possible from the viewpoint of preventing liquid leakage of the paint and preventing fatigue during operation. Specifically, the distance d is preferably 4 to 10 mm, and more preferably 4 to 7 mm. In addition, by ensuring the load (strain energy) by the compression coil spring, ON / OFF of the paint discharge can be ensured. In the needle valve as described above, liquid leakage can be prevented with a load of 3.0 N or more, particularly 5.0 to 20 N.

  Next, a method for painting using the painting system configured as described above will be described below. First, the paint is filled into the container body 11 of the paint tank 2. Although it does not specifically limit as a coating material used in this embodiment, A well-known thing can be used, For example, the coating material containing an epoxy resin and an amine hardening | curing agent can be used conveniently as an anticorrosion coating material of a steel tower. The viscosity of the paint is suitably 0.3 to 30 Pa · s, preferably 0.5 to 5 Pa · s (viscosity measured at 60 rpm using a B-type viscometer).

  After filling the paint, the set pressure of the pressure regulator 4 is adjusted so that the discharge flow rate of the paint from the paint tank 2 to the applicator 6 is 3 to 10 ml / second, preferably 4 to 8 ml / second. For example, the compressed gas can be supplied to the gas cylinder 3 by adjusting the set pressure of the pressure adjuster within a range of 0.05 to 0.5 MPa.

  Subsequently, one of the operation levers 66 is pushed in, and the needle valve 65 is opened. As a result, the paint is discharged from each of the discharge nozzles 63a, 63b, 63c, so that the surface to be coated is brush-coated.

  As described above, according to the present embodiment, since the plurality of discharge nozzles 63a, 63b, and 63c are provided, it is possible to apply to a surface to be applied having a large area. Further, since the discharge amount of the paint from the first discharge nozzle 63a is configured to be larger than the discharge amount of the paint from the third discharge nozzle 63c, the discharge amount of the paint to the inside of the brush portion 62 is increased. From a low-viscosity paint to a high-viscosity paint (for example, 0.3 Pa · s to 30 Pa · s) that is properly controlled, the paint content in the brush portion 62 is good, and the film thickness is uniform in a short time. Can be painted.

  In addition, since the handle 61 and the two operating levers 66a and 66b are provided, it is possible to select either a pen grip or a palm hand while maintaining a compact brush usability. The design is such that the brush portion 62 can be turned even in difficult-to-reach painting places, and the user-friendliness of the painter can be improved in correspondence with all painting places even in high-altitude work. For example, as shown in FIG. 5, depending on the ease of use and the part to be painted, the paint operator can hold either the pen grip (FIG. 5 (a), FIG. 5 (b)) or the palm hand (FIG. 5 (c)). Can also choose. Further, as shown in FIGS. 5A and 5B, an operation lever arranged at an easy-to-operate position can be selected from the two operation levers 66a and 66b depending on how to hold the operation lever. .

5 Flexible tube (supply member)
6 applicator 60 body portion 61 handle 62 brush portion 63a first discharge nozzle 63b second discharge nozzle 63c third discharge nozzle 66a first operation lever 66b second operation lever 67 channel

Claims (7)

An applicator detachably connected to a supply member to which paint is supplied by the action of compressed gas,
A main body having a flow path through which the paint supplied from the supply member flows;
A plurality of discharge nozzles branched from the flow path;
A plurality of bristles are configured to be bundled, and include a brush part that is attached to the main body part and accommodates the plurality of discharge nozzles,
Among the plurality of discharge nozzles, the discharge amount of the paint from the discharge nozzle farthest from the supply member is configured to be larger than the discharge amount of the paint from the discharge nozzle closest to the supply member. Applicator. In the main body portion, a rod-like handle that is attached to the opposite side of the discharge nozzle and can be supported by a hand,
A control unit for controlling the supply of paint to the discharge nozzle;
A first operating lever and a second operating lever for driving the control unit;
The said 1st and 2nd operation lever is extended in the different direction on both sides of the said control part, The coating tool of Claim 1 with which the one said operation lever is extended in the said handle | steering-wheel side. The control unit has a needle valve that opens and closes the middle of the flow path,
The paint tool according to claim 2, wherein the needle valve is opened and closed by pressing one of the first and second operation levers. A fixing device for swinging the operation levers relative to the main body;
Each of the operation levers is swingable around the fixture, and is configured to move the valve body of the needle valve in the axial direction by the swing.
The paint tool according to claim 3, wherein a distance between the fixture and the axial center line of the valve body is 4 to 10 mm. The nozzle lengths of the plurality of discharge nozzles are the same,
The nozzle diameter of the discharge nozzle that is located farthest from the supply member is 1.2 to 3.0 times the nozzle diameter of the discharge nozzle that is closest to the supply member. The applicator according to crab.   The applicator according to any one of claims 1 to 5, wherein a discharge port of the discharge nozzle is located at a position of 5 to 50 mm from a hair tip of the brush part. A coating method using the coating tool according to any one of claims 1 to 6,
Providing a paint having a viscosity of 0.3-30 Pa · s;
Supplying the paint to the main body so as to be 3 to 10 ml / second;
Discharging paint from the nozzle and applying the paint to the surface to be applied by the brush part; and
It is equipped with a painting method.

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